Adjustment - Kenwood TK-885 Service Manual

TK-885
Test Mode
Test Mode Operating Features
This transceiver has a test mode. To enter test mode,
press [B] key and turn power on. Hold [B] key until test
channel No. and test signalling No. appears on LCD.
Test mode can be inhibited by programming. To exit test
mode, switch the power on again. The following functions
are available in test mode.
• Controls ("FCN" appears)
[PTT]
[ ]
[A]
[B]
[ C]
[D ]
[CALL]
[System Up/Down]
[Volume Up/Down]
• Controls ("FCN" not appears)
[PTT]
[ ]
[A]
[B]
[ C]
[D ]
[CALL]
[System Up/Down]
[Volume Up/Down]
Note : If a [A], [B], [ C], [D
mission, the DTMF corresponding to the key that was
pressed is sent.
• LCD indicator
"SCN" Unused
" " Lights at compander on.
"AUX" Unused.
" " Lights at RF power low.
"MON" Lights at monitor on.
"SVC" Unlock.
" " Lights at FFSK 2400 bps.
• LED indicator
Red LED Lights during transmission.
Green LED Lights when there is a carrier.
• Sub LCD indicator
"FCN" Appears at shift on.
32

ADJUSTMENT

Used when making a transmission.
Function off.
FFSK 1200 bps and 2400 bps.
Shift off.
Compander function on and off.
Beat shift on and off.
Monitor on and off.
Shift off.
Volume up/down.
Used when making a transmission.
Function off.
Sets to the tuning mode.
Shift on.
RF power high and low.
Changes signalling.
Monitor on and off.
Changes channel.
Volume up/down.
] key is pressed during trans-
Frequency and Signalling
The set has been adjusted for the frequencies shown in
the following table. When required, re-adjust them follow-
ing the adjustment procedure to obtain the frequencies you
want in actual operation.
• Frequency (MHz)
Channel No. RX
1 455.05000
2 440.05000
3 469.95000
4 455.00000
5 455.20000
6 455.40000
7~16 –
• Signalling
Signalling No. RX
1 None
2 None
3 QT 67.0Hz
4 QT 151.4Hz
5 QT 210.7Hz
6 QT 250.3Hz
7 DQT 023N
8 DQT 754I
9 None
10 None
11 None
12 None
13 None
14 FFSK code
Preparations for Tuning the Transceiver
Before attempting to tune the transceiver, connect the
unit to a suitable power supply.
Whenever the transmitter is turned, the unit must be
connected to a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a
4Ω dummy load and connected to an AC voltmeter and an
audio distortion meter or a SINAD measurement meter at all
times during tuning.
Transceiver Tuning
(To place transceiver in tuning mode)
Channel appears on LCD. Set channel according to tun-
ing requirements.
LCD display (Test mode)
–
1
Channel No.
TX
455.10000
440.10000
469.90000
455.00000
455.20000
455.40000
–
TX
None
100Hz square
QT 67.0Hz
QT 151.4Hz
QT 210.7Hz
QT 250.3Hz
DQT 023N
DQT 754I
DTMF tone 9
Single tone 1200Hz (HSD out)
Single tone 1200Hz (MODEM out)
Single tone 1800Hz (MODEM out)
FFSK (PN pattern)
FFSK code
1
Signalling No.